HUB AND SPOKES MODEL
In this model we propose a two stage hub and spokes model consisting of a large scale biomass consumer like biomass power plant as the centre and it is surrounded by m number of briquetting plants. Each briquetting plant acts as a centre in turn and surrounded by n number of biomass collection centers. The biomass collection centers acts as buying agents and send the raw material to the biomass briquetting plants where they are stored, processed, packed and sent to biomass power plant. The electricity produced is to be connected to the grid to be distributed back to the same rural region. It will be a self sustaining model suitable very well for remote regions and also for any area where there is sufficient availability of biomass waste which is not used for cattle feed. It will generate rural employment and enhance their living standard.
1. Each collection center fixes its purchase price depending on the raw material available and its quality, 2. Biomass is not stored in collection centers, they are sent to briquetting plants for storage, 3. Each biomass briquetting plant fixes the price for its product in consultation with biomass power plant regularly, 4. Each biomass collection center should send the material only to its corresponding briquetting plant, 5. Each briquetting plant should send its produce only to the central biomass power plant, should not sell in the retail market, 6. Central biomass power plant should accept all the collected biomass supplied from the m briquetting plants and for shortage of loads it may purchase raw material outside, 7. Money should be settled at real time at all stages of the network.
ABBREVIATIONS AND NOTATIONS
BPP : Biomass power plant
BBP : Biomass briquetting plant
BCC : Biomass collection center
BBPm : mth biomass briquetting plant
m : number of biomass briquetting plant
nm : number of collection centre for mth briquetting plant
CRmn : Cost of raw material for the collection center n of the briquetting plant m
CTmn : Cost of transportation from the collection center n to the briquetting plant m
CIm : Cost of inventory at the briquetting plant m
CPm : Cost of processing at the briquetting plant m
BCm : Cost of briquette from briquetting plant m
TCm : Transportation cost from briquetting plant m to biomass power plant
Fig 3 : The structure of the proposed hub and spokes model
COST DETAILS OF BRIQUETTES
Cost of raw material for the collection center n of the briquetting plant m (CRmn) roughly works out to be Rs. 1000 per ton. It does no show much variation between regions and it depends mostly on the type and condition of the raw material than the regional factors. On wet conditions it works out to be 500 Rs/ton due to its moisture content and hence lesser calorific vale and hard dry materials which can be directly used as household fuel costs upto 1500 Rs/ton.
Cost of transportation from the...